package com.mall.order.biz.handler;

import com.alibaba.fastjson.JSON;
import com.mall.commons.tool.exception.BizException;
import com.mall.order.biz.context.CreateOrderContext;
import com.mall.order.biz.context.TransHandlerContext;
import com.mall.order.dal.entitys.Stock;
import com.mall.order.dal.persistence.OrderItemMapper;
import com.mall.order.dal.persistence.StockMapper;
import com.mall.order.dto.CartProductDto;
import lombok.extern.slf4j.Slf4j;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

/**
 * @Description: 扣减库存处理器
 * @Author： wz
 * @Date: 2019-09-16 00:03
 **/
@Component
@Slf4j
public class SubStockHandler extends AbstractTransHandler {

    @Autowired
    private StockMapper stockMapper;

    @Override
    public boolean isAsync() {
        return false;
    }

    @Override
    @Transactional
    public boolean handle(TransHandlerContext context) {
        CreateOrderContext orderContext = (CreateOrderContext) context;
        List<CartProductDto> cartProductDtoList = orderContext.getCartProductDtoList();
        ArrayList<Long> ids = new ArrayList<>();
        for (CartProductDto cartProductDto : cartProductDtoList) {
            ids.add(cartProductDto.getProductId());
        }
        orderContext.setBuyProductIds(ids);
        List<Long> buyProductIds = orderContext.getBuyProductIds();
        /*if (CollectionUtils.isEmpty(buyProductIds)) {
            for (CartProductDto cartProductDto : cartProductDtoList) {
                buyProductIds.add(cartProductDto.getProductId());
            }
        }*/
        // 锁定库存
        List<Stock> stockList = stockMapper.findStocksForUpdate(buyProductIds);
        if (CollectionUtils.isEmpty(stockList)) {
            throw new BizException("库存未初始化");
        }
        if (stockList.size() != buyProductIds.size()) {
            throw new BizException("部分库存未初始化");
        }

        // 扣减库存
        for (CartProductDto cartProductDto : cartProductDtoList) {
            Long productId = cartProductDto.getProductId();
            Long productNum = cartProductDto.getProductNum();
            Stock stock = new Stock();
            stock.setLockCount(productNum.intValue());
            stock.setStockCount(productNum);
            stock.setItemId(productId);
            stockMapper.updateStock(stock);
        }
        return true;
    }
}